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July 2008

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Subject:
From:
James Mahoney <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, James Mahoney <[log in to unmask]>
Date:
Mon, 7 Jul 2008 15:40:39 -0400
Content-Type:
text/plain
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text/plain (76 lines)
I agree that the drawing should specify "after all plating" which includes
your surface finish. Your tolerance includes all metals being applied to
that PTH.

Thank you,
Jim Mahoney
Quick Turn Flex Circuits, LLC
Applications Project Manager
P# 603-821-6571
F# 603-821-5723
M# 603-305-6250


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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Monday, July 07, 2008 3:15 PM
To: [log in to unmask]
Subject: [TN] Flex specifications - tolerance on hole size

Hello TechNet
A question about through-holes on a flex.  We are having some debate about
how to interpret a drawing.

Specifically, if I have a drawing that says:
1) fabricate per IPC 6013 type 4
2) tin-lead plating shall be per IPC 2221, method optional
3) hole size is specified in the drill schedule as 0.028", plated, +- 0.003"

Our debate is about the hole size after plating.  Does the +- 0.003" apply
to the solder coated hole, or is that a copper only size?  Does IPC-2221
specify any maximum solder thickness?

I'm an assembler, so unfortunately I don't have these two IPC specs at hand.


regards,
 
Graham Collins
Halifax Production Engineering
(902) 873-2000 ext. 6215


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